/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nutch.webui.service.impl;

import java.sql.SQLException;
import java.util.List;

import javax.annotation.Resource;

import org.apache.nutch.webui.client.NutchClient;
import org.apache.nutch.webui.client.NutchClientFactory;
import org.apache.nutch.webui.client.impl.CrawlingCycle;
import org.apache.nutch.webui.client.impl.RemoteCommandsBatchFactory;
import org.apache.nutch.webui.client.impl.CrawlingCycleListener;
import org.apache.nutch.webui.client.impl.RemoteCommand;
import org.apache.nutch.webui.client.impl.RemoteCommandExecutor;
import org.apache.nutch.webui.client.model.Crawl;
import org.apache.nutch.webui.client.model.Crawl.CrawlStatus;
import org.apache.nutch.webui.model.NutchInstance;
import org.apache.nutch.webui.service.CrawlService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

import com.j256.ormlite.dao.Dao;

@Service
public class CrawlServiceImpl implements CrawlService, CrawlingCycleListener {
	private Logger log = LoggerFactory.getLogger(CrawlServiceImpl.class);

	@Resource
	private Dao<Crawl, Long> crawlDao;

	@Resource
	private NutchClientFactory nutchClientFactory;

	@Resource
	private RemoteCommandsBatchFactory commandFactory;

	@Override
	@Async
	public void startCrawl(Long crawlId, NutchInstance instance) {
		Crawl crawl = null;
		try {
			crawl = crawlDao.queryForId(crawlId);
			NutchClient client = nutchClientFactory.getClient(instance);
			String seedDirectory = client.createSeed(crawl.getSeedList());
			crawl.setSeedDirectory(seedDirectory);

			List<RemoteCommand> commands = commandFactory.createCommands(crawl);
			RemoteCommandExecutor executor = new RemoteCommandExecutor(client);

			CrawlingCycle cycle = new CrawlingCycle(this, executor, crawl,
					commands);
			cycle.executeCrawlCycle();

		} catch (Exception e) {
			crawl.setStatus(CrawlStatus.ERROR);
			saveCrawl(crawl);
			log.error("exception occured", e);
		}
	}

	@Override
	public List<Crawl> getCrawls() {
		try {
			return crawlDao.queryForAll();
		} catch (SQLException e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	public void saveCrawl(Crawl crawl) {
		try {
			crawlDao.createOrUpdate(crawl);
		} catch (SQLException e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	public void deleteCrawl(Long crawlId) {
		try {
			crawlDao.deleteById(crawlId);
		} catch (SQLException e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	public void crawlingStarted(Crawl crawl) {
		crawl.setStatus(CrawlStatus.CRAWLING);
		crawl.setProgress(0);
		saveCrawl(crawl);
	}

	@Override
	public void onCrawlError(Crawl crawl, String msg) {
		crawl.setStatus(CrawlStatus.ERROR);
		saveCrawl(crawl);
	}

	@Override
	public void commandExecuted(Crawl crawl, RemoteCommand command,
			int progress) {
		crawl.setProgress(progress);
		saveCrawl(crawl);
	}

	@Override
	public void crawlingFinished(Crawl crawl) {
		crawl.setStatus(CrawlStatus.FINISHED);
		saveCrawl(crawl);
	}
}
